Tennis ball evaluator

Details Tennis ball evaluator Tennis ball evaluator

1983-10-05

1985-06-25

Ruehl, Charles A.

Measuring and testing

Wind tunnel: aerodynamic wing and propeller study

73105, 73432R, G01M 900

Patent

active

045246149

ABSTRACT:
An apparatus and device for evaluating the surface roughness of a tennis ball or other objects. The object is placed in flowing gas and the drag force applied on the object is measured. By repeating the procedure with objects having different surface roughness a cross-reference table is developed between drag force and surface roughness. The apparatus comprises a scale supporting the object. The object is placed in a tube and gas is blown through the tube past the object, while the drag force on the object is measured by the scale.

REFERENCES:
patent: 2700305 (1955-01-01), Kendall
patent: 3714824 (1973-02-01), Bush

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